body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    font-size: 16px;
    font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
  }
  
  * {
    box-sizing: border-box;
  }
  
  h1, h2, h3, h4, h5, h6, p {
    margin: 0;
    padding: 0;
    line-height: unset;
  }
  
  a {
    text-decoration: none;
    color: #333333;
  }
  
  /*滚动条凹槽的颜色，还可以设置边框属性 */
  ::-webkit-scrollbar-track-piece {
    background-color: #f8f8f8;
    -webkit-border-radius: 2em;
    -moz-border-radius: 2em;
    border-radius: 2em;
  }
  
  /*滚动条的宽度*/
  ::-webkit-scrollbar {
    width: 9px;
  }
  
  /*滚动条的设置*/
  ::-webkit-scrollbar-thumb {
    background-color: #dddddd;
    background-clip: padding-box;
    -webkit-border-radius: 2em;
    -moz-border-radius: 2em;
    border-radius: 2em;
  }
  
  /*滚动条鼠标移上去*/
  ::-webkit-scrollbar-thumb:hover {
    background-color: #bbb;
  }
  